WO2012152388A1

WO2012152388A1 - Sanitary product in piece form

Info

Publication number: WO2012152388A1
Application number: PCT/EP2012/001818
Authority: WO
Inventors: Joachim Leipold; Matthias Fritz; Edgar Jaeschke
Original assignee: Buck-Chemie Gmbh
Priority date: 2011-05-06
Filing date: 2012-04-27
Publication date: 2012-11-15
Also published as: EP2704753B1; AR086271A1; EP2704753A1; TW201245440A; US9187720B2; DE102011100859A1; WO2012152388A9; US20140349904A1

Abstract

The invention relates to the use of a sanitary product in piece form for use in the cistern of a toilet, which product comprises at least two different gel formers (1, 2) and fragrances, wherein one gel former (gel former 1) forms gels with hydrophobic liquids, which gels are insoluble or scarcely soluble in water, and the other gel former (gel former 2) is water-soluble or water-dispersible and wherein the product is transparent, gradually flushes away and releases fragrances, and gel formers 1 and 2 are in one phase.

Description

Piece-shaped sanitary agent

The present invention relates to a piece-shaped means for the scenting of toilets, which is intended for use in a water tank.

Toilet cleaners that also serve as air freshener by scenting the toilet area are known in the art. These are usually attached to a holder or in a basket or cage-like container in the toilet bowl at a point which is flowed through in each flushing of incoming rinse water, whereby the agent gradually consumed.

The life of these toilet cleaners is therefore determined by the number of flushes in the toilets, in the toilet bowl they are attached. This achieved lifetime and the content of fragrances for the room scenting are regularly at the Ge

CONFIRMATION COPY is oriented by a family of 3 to 4, so that sufficient room fragrancing can no longer take place if the household or the place in whose area the toilet containing the detergent is located is used by fewer persons and / or not permanently becomes. At the same time, the Abspregregulative contained in such detergents in the form of z. As nonionic surfactants that the fragrances are more or less retained and can not evaporate into the environment of the toilet area.

DE 197 10 635 A1 teaches an agent that serves for attachment to the toilet rim and that achieves sufficient and permanent room scenting even with a small number of rinsing cycles. The agent comprises fragrances and is present as lyogel, ie as a liquid-rich disperse system comprising at least two components, namely a solid, colloidally divided gelling agent and a liquid as dispersant. These agents dissolve when rinsed with water in a basket generally after 100 to 250 rinses and correspond due to their transparency and the consumer desires.

U.S. Patent 4,666,671 discloses toilet toilet room freshening blocks containing gelling agents, perfumes and solvents. With these space-freshening blocks in gel form, it is indeed possible to achieve a constant room fragrance even in the case of toilets that are not used very often or not permanently. However, these blocks serve only the room freshening of the toilet area and do not dissolve.

EP 1 553 162 Bl discloses agents with a solid phase and a transparent gel phase based on polyamide resin with fragrances for perfuming, which serve for use in a toilet bowl. A disadvantage of these agents, however, is that the gel phase does not dissolve in Toilet ^¬ tenkörbchen when rinsing with water but must be disposed of as a residue. From EP 1 632 251 AI a fragrancing product for the sanitary sector is known, which consists of two separate solid carriers. One of the carriers is transparent and the agents are preferably two-colored in order to obtain an attractive product.

For use in the water tank, cleaning and / or scenting agents are known which comprise and are extruded from surfactants, fragrances, in some cases also dyes, bleaching agents, etc. These agents are for storage in cold water, generally dissolve completely only after 400 or more rinses, and are not transparent.

Furthermore, two-phase means for the water tank are known, for example, the "Blink Blauspüler" from Budich International, Hiddenhausen, which includes a cleansing Blauspüler second phase as a lime core or the "Bloo Power Core" Jeyes, in addition to a blue-rinse detergent molded article phase as second phase comprises a fast-dissolving part with further active phases with fragrance and foam.

The fragrance of the toilet with the known water box products, however, is low, since the known means are generally extruded detergent tablets, which can absorb only small amounts of fragrance, otherwise they would be sticky and not extrudable. In addition, the previously known in-tank products do not meet the consumer's wishes in terms of transparency.

For application in the water tank so far no means is known that can absorb high perfume concentrations, long service life in the water of the water box achieved, yet dissolves and is transparent.

The object of the present invention is to provide a sanitary agent for the water box of toilets, which scents the toilet area for a long period of time, which gradually dissolves and is transparent. This object is achieved by an agent comprising fragrances and at least two gelling agents, wherein a first gelling agent (gelling agent 1) forms heavy or insoluble gels with hydrophobic liquids in water and the second gelling agent (gelling agent 2) is water-soluble or water-dispersible and gelling agent 1 and 2 in one phase.

According to the invention, a combination of at least two gelling agents (gelling agent 1 and gelling agent 2) is used in the composition.

One gelling agent (gelling agent 1) serves to gel with the hydrophobic perfumes and is selected from the group of polyamide resins or olefin homopolymers and copolymers of two or more olefins.

Gel formers from the group of polyamide resins are preferably an ester-terminated polyamide (ETPA), an ester-terminated dimer acid-based polyamide resin (ETDABP), an amide-terminated polyamide (ATPA) or a polyalkyleneoxy-polyamide (PAOPA). These polyamide resins can form transparent clear gels which are difficult or insoluble in water with hydrophobic liquids such as perfume oils and fragrances.

As water-insoluble or insoluble gelling agent 1 from the class of ester-terminated polyamides (ETPA), a composition of the formula

(1) where n denotes a number of repeating units such that ester groups constitute from 10% to 50% of the total number of ester and amide groups; R ¹ at each occurrence is independently selected from an alkyl or alkenyl group containing at least 4 carbon atoms; R ² independently at each occurrence is selected from a C _4-4 2 hydrocarbon group with the proviso that at least 50% of the R ² groups have 30-42 carbon atoms; R ³ at each occurrence is independently selected from an organic group containing at least two carbon atoms in addition to hydrogen atoms and optionally containing one or more oxygen and nitrogen atoms; and R ^3a is independently selected at each occurrence from hydrogen, Ci-i ₀ alkyl and a direct bond to R ³ or another R ^3a such that the N atom to which R ³ and R ^3a are both bonded is part of a heterocyclic structure defined in part by R ^3a -NR ³ such that at least 50% of the R ^3a groups are hydrogen.

Such compounds are described in EP 0 939 782 Bl of Arizona Chemical Co.

As an ester-terminated dimer acid-based polyamide resin

(ETDABP), a compound of the following formula (2) can be selected:

(2) wherein n denotes a number of repeating units, so that ester groups from 10% to 50% of the total of the ester and

Make amide groups; R ¹ at each occurrence is independently selected from hydrocarbon groups; R ² at each occurrence is independently selected from a C _2-4 hydrocarbon group with the proviso that at least 10% of the R ² group has ^30-42 carbon atoms; R ³ at each occurrence is independently selected from an organic group containing at least two carbon atoms in addition to hydrogen atoms, and optionally containing one or more oxygen and nitrogen atoms; and R ³ at each occurrence is independently selected from hydrogen, C-i ₀ alkyl and a direct ^¬ th bond to R ³ or another R ^3a such that the N atom to which R ³ and R ^{3a are} both attached, is part of a heterocyclic structure partially defined by R ^3a -NR ³ .

Such compounds are described in EP 1 027 032 Bl of Arizona Chemical Co.

Furthermore, as gelling agent 1 and olefin homopolymers and

Copolymers of two or more olefins can be used. These compounds include e.g. the polybutadiene rubbers, the styrene-butadiene block u. copolymers and the polyisopropenes. Also useful are "random (block) polymers" prepared by the 1,3-addition of butadiene or isoprene to styrene or alpha-methyl styrene, the homopolymers or copolymers of ethylene and propylene, such as the ethylene-propylene diene terpolymer, of natural rubber and norbornene polymers such as polydicyclopentadiene. The compounds from the group of olefin homopolymers and copolymers may also be partially hydrogenated.

The gel formers 1 from the group of polystyrene derivatives are preferably mineral oil-soluble, cross-linked

Polystyrene derivatives, in particular to Alkylenstyrol copolymers, such as the hydrogenated butylene / ethylene / styrene copolymers and the hydrogenated ethylene / propylene / styrene copolymers, which are available, for example in dissolved form from Penreco under the trade name Versagel M750 or Versagel M1600. These polymers themselves are available from Shell as Kraton grades.

For the purposes of the present invention, the gel gelled with the gelling agent 1 and the fragrances are then difficultly or insoluble or not completely dispersible with water, when about 0.5 grams of the composition with the addition of about 30ml of tap water at room temperature for at least 24 hours after which, after shaking the vessel, the supernatant liquid is removed by decantation, this procedure being repeated at least 5 times within 8 days without complete dissolution / completion. dige dispersion of the agent is observed. If the agent is also dissolved at least 10% after 43 days, it can be used as an agent for the purposes of the invention. In other words, such systems are unsuitable, which are completely solved after only a few shaking tests and suitable are those means that gradually go into solution after a longer shaking cycle. In the embodiment V3 in Table 1 described below, this is the case for the cistern of a real toilet after about 450 flushes at a starting weight of 13, 4 gr.

The second gelling agent (gelling agent 2) is water-soluble or

water-dispersible. Through him now the desired water solubility of the agent and the desired flushing numbers can be adjusted.

The second gelling agent is selected from the class of surfactants, water-soluble or water-dispersible polyamide resins or gel-forming natural or synthetic polymers.

The surfactants used are preferably gel-forming anionic or nonionic surfactants, wherein agents with surfactants as gel formers 2 are distinguished by an additional cleaning action.

It is essential that these surfactants are also gelling agents, since otherwise the agents would cloud and lose the desired transparency.

The anionic surfactants require at least one water-solubilizing anionic group such as. B. a carboxylate, phosphate,

Sulfate, phosphonate, sulfonate and at least one lipophilic alkyl and / or aryl group having 8 to 30 carbon atoms. In addition, further groups such as glycol or polyglycol ether groups, ester, ether and amide groups, hydroxyl groups, in each case in the form of the sodium, potassium, calcium, magnesium, zinc and ammonium and the mono-, di- and trialkanolammonium salts having from 2 to 4 carbon atoms in the alkanol group in the molecule. In particular, the following compounds can be used as gel-forming anionic surfactants:

Acyl isethionates having 8 to 30 carbon atoms in the acyl group, acylsarcosides having 8 to 30 carbon atoms in the acyl group, acyl taurides having 8 to 30 carbon atoms in the acyl group, alkanesulfonates (linear) having 8 to 30 carbon atoms, alkyl , Aryl and / or alkenyl ether phosphates having an aliphatic hydrocarbon radical having 8 to 30 carbon atoms,

Alkylpolyglykolethersulfate with preferably linear alkyl groups, having 8 to 30 carbon atoms, alkyl sulfates, alpha-sulfofatty acid methyl esters of fatty acids having 8 to 30 carbon atoms, amide (o) ethercarbonsäuren, protein fatty acid condensates (Lamepon® types, Amisoft® types),

Ethercarboxylic acids having a linear alkyl group with 8 to 30 carbon atoms, fatty acid alkylene glycol esters, hydroxysulfonates, linear alpha-olefin sulfonates having 8 to 30 carbon atoms, monoglyceride (ether) sulfates, sulfated hydroxyalkyl / aryl polyethylene and / or hydroxyalkylene arylenepropylene glycol ethers, sulfosuccinic monoalkyl /

arylpolyoxyethyl esters having 8 to 30 carbon atoms in the alkyl / aryl group and 1 to 6 oxyethyl (propyl) groups, sulfosuccinic mono- and dialky / aryl esters having 8 to 30 carbon atoms in the alkyl / aryl group and sulfonates of unsaturated fatty acids with 8 up to 30 carbon atoms and 1 to 6 double bonds.

Also lauryl ether sulfates, fatty alcohol polyethylene glycol ether sulfate,

Laurylbenzenesulfonates, Alkylpolyglykoletherphosphate can be used.

The use of the acidic alkylpolyglycol ether phosphates makes it possible to adjust the pH of the composition so that an acidic agent is also obtainable and the agent can thus also be used as descaling agent.

These acidic anionic surfactants are less susceptible to hardness factors of water such as calcium or magnesium ions as phosphoric acid esters, have a good lime soap dispersibility, are very resistant to alkalis and with anionic, amphoteric and nonionic surfactants compatible. Furthermore, they are corrosion-resistant, completely biodegradable and correspond to the

Detergents Regulation of EC No. 648/2004.

The acidic alkylpolyglycol ether phosphates are available, for example, under the trade names Phosfetal from Zschimmer & Schwarz, Lahnstein, Germany, Crafol from Cognis or Naxonac from Nease Performance Chemicals.

By using alkylbenzenesulfonates as the second gelling agent, an additional cleaning action and, in addition, foam development can likewise be achieved.

In a particularly preferred variant, both alkylbenzenesulfonate and fatty alcohol-polyethylene glycol ether sulfate are used in the composition as second or further gel formers.

Also suitable as gelling agents are natural or synthetic polymers, such as celluloses, in particular sodium carboxymethylcelluloses,

Hydroxyethylcellulosen, hydroxypropylcellulose or polysaccharides such as agar-agar, gum arabic, locust bean gum or starch, polyacrylates, polysaccharides, polyvinyl alcohols or polyvinylpyrrolidone, alginates, diurethanes, gelatin or pectins.

As the water-soluble or water-dispersing polyamide resins (2 gelling agent), for example, block copolymers of the formula hydrocarbon-polyether-polyamide-polyether-hydrocarbon may be used to ^¬, wherein copolymers in which the polyamide block of the formula oo

-fR-CNH-R ⁴ - HNC- † - comprises, wherein R ^{3 is} a hydrocarbon and R ^{4 is selected} from hydrocarbons ^¬ and polyethers, are preferred. Such connections fertilize are described in EP 1 358 248 Bl of Arizona Chemical Co.

Furthermore, water-soluble polyamide resins, for example polyamide-6 or polyamide-4, which are gelled with medium- or high-polarity liquids and can be obtained from Arizona Chemical under the name Silvaclear PE400V or Silvaclear WF1500V, can be used. The water-soluble polyamide resin available from Arizona Chemical under product number X54-188-152 is also usable.

The sole use of the second gelling agent (without the first gelling agent) would result in storage of the agent in water that the agent dissolves immediately or after a few rinses.

In this respect, the invention provides for the combination of the two gelling agents together with perfume.

The fragrances used are preferably mixtures of generally hydrophobic perfume oils.

The perfume fraction can be up to 70% by weight in agents containing polyamide resins, so that long-lasting scenting of the toilet is achieved via the agent in the cistern in water.

The concentration of gelling agent (1) should be between 5 and 80% by weight, preferably between 8 and 60% by weight and more preferably between 15 and 50% by weight, that of gelling agent (2) should be between 5 and 80% by weight. , preferably between 8 and 60% by weight and more preferably between 15 and 50% by weight, and the concentration of the perfume should in particular be between 1 and 40% by weight, preferably between 3 and 30% by weight and more preferably between 4 and 15 % By weight. The concentration ratio between gelling agent 1: gelling agent 2 should be between 95 and 5, preferably between 90 and 10 and more preferably between 80 and 20.

In order to achieve the desired scenting and the desired dissolution behavior, the two gelling agents 1 and 2 should be present in the agent in one phase.

The agent according to the invention on the one hand has flushing numbers of at least 150 with steric hindrance such as at least partial covering with a different mass of more than 200 in permanent storage in cold water, on the other hand, it dissolves gradually, so that in the water tank no unwanted residues remain. In any case, the agent should have dissolved with a mass of 50 g, preferably up to 500 and a maximum of 800 rinses.

In addition, it has been possible to provide such a means with high flush numbers for the water tank as well as a means that can scent the toilet over a long period of time, while maintaining the desired transparency of the agent.

A means is transparent in the sense of the present invention, if it is transparent at the time of first use. Whether the agent in use in the water tank gradually loses its transparency is irrelevant, since at that time the means for the consumer is no longer visible.

The transparency of the agent is determined by whether fonts of decreasing size are readable by different layer thicknesses of the agent. To determine the transparency of the agent, the batches were poured into aluminum molds (internal dimension: 5 cm or 2.5 cm, thickness x 2 cm, width x approx. 8 cm height), cooled overnight and pressed out of shape the next day. The readability of a font of 3, 5 or 7 pixels height, which was created on an HP Laserjet 2100, was assessed

Transparent according to the invention, if at least one 7-pixel layer is readable by a 25 mm layer thickness, particularly good

Transparency occurs when the readability of a 5 or 3 pixel layer is still legible through a 49 mm thick block.

The compositions of the invention are also characterized by a sufficient hardness at room temperature. The agents are cut-resistant at room temperature and dimensionally stable.

The invention also relates to a method for scenting toilets.

The scenting takes place in that the sanitary agent described above is placed in the water box of a toilet. The agent gradually dissolves in cold water and settles continuously

Fragrances free, which scented the toilet.

The invention will be described in more detail below with reference to exemplary embodiments.

1. Embodiments of the invention

The following table contains the various embodiments according to the invention. I V2 V3 manufacturer

[%] [%] [%]

Material Weighing Weighing Weighing

Arizona

PE 400 V 60 58 Chemical gelling agent 1

Arizona

AF 1900 2 7 Chemical gelling agent 1 Arizona

PA 1200 66 Chemical Gel former 1

Phosfetal Zschimmer

201 23 & Schwarz Gelbildner 2

Marlinat

242 / 90T 20 30 Sasol gel former 2

orange

Fun 15 15 4 Givaudan perfume

Weighing stone 31 gr 30.6 gr 13.4 gr

transparency

through a 25th

mm thick block;

font size

7 pixels readable n.b.

transparency

by 49 mm

wide block; no more

3pt font size readable n.b.

Transparency in remains

Cistern after transpa12 h will white will rent white

Oberflächen54,4; 56,7; 50, 1;

voltage 48.2; 45.9 47.6 n.b.

Foam 80; 75; 50 90; 80; 75 n.b. PH value;

20.6 ° C 3.78 4.79 n.b.

Flushing ca 30 ca 30> 450

Table 1 The alkyl polyglycol ether phosphate used was Phosfetal 205, available from Zschimmer & Schwarz. The pH of a 1% solution is 2. The alkyl group is a C14-C18 group, the "polyglycol ether" group has between 1 and 3 glycol units.

Marlinat 242 / 90T consists of C12-C14-alcohol-polyethylene glycol and propylene ether (2 EO) sulfate, glycol triisopropanolammonium salt (from Sasol)

Determination of flush numbers:

The flushing rates were determined so that the agent was thrown into the cistern or hung in the basket, the level was about 8 liters of water at a temperature of 16 ° C.

Each rinse was completely emptied and then refilled to 8 liters.

Subsequently, the number of rinses required until complete dissolution of the agent was determined.

Experimental evaluation:

1) There are transparent, z. T. highly transparent masses.

2) The masses are all surfactant- and perfume-containing.

3) Poorly adjusted systems can be produced.

4) There are systems (eg V3) that have high flushing rates, similar to extruded stones and remain transparent! 2. Comparison experiments from the prior art

DE 197 10 635 WO 99/66017

Gelling agent 31.6% polyoxyethylene 10 13% alkyl polyglycol ether 35

EO

Gel former 19.2% polyoxyethylene 11 13% alkyl polyglycol ether 30

EO

Gel former 5.3% Na stearate

Perfume 32.60% 6.50% Other 4.7% Water 6% arylate 242 / 90T

4.7% propylene glycol 0.003% dye

0.09% dye 48% water

1.8% DBS, Na salt 1.3% polyethylene glycol 6000

12% glycerol (86.5 percent)

Transparency unreadable due to typeface font Very good, lasting

at 49 mm layer thickness

(becomes dim over time)

Water solubility completely complete

half of less than 15

Rinsing cycles in the water tank

Fragrance up to 35% ~ 6.5%

Physical state solid, not dimensionally stable high viscosity pH value (1% water approx. 7 approx. 7

dist.) Foam number 1% solution + 60 mL + 80 mL

Surface tension 47 mN / m 66 mN / m

100 ms (1% solution)

Gelling agent stearate / nonionic surfactant nonionic surfactants de

Table 2

Evaluation:

Although the previous systems can handle high concentrations of fragrance and are also transparent, they are neither strong enough nor sufficiently rinsable to be used as an agent in the cistern. In addition, they can not be acidified.

3. Table of various formulations according to the invention

Table 3 shows various mixtures of gelling agents 1 and 2 with perfume additive; the release behavior is shown in Tables 4 and 5.

Table 3

Imbentin AG: Imbentin AG / 168/110 Co. Kolb Chemie

Gelatine: Fa. Merck

Tego Carbomer: Goldschmidt AG

G2, Gl: gelling agent 2 and gelling agent 1 4. Solubility behavior of the test according to the invention from Table 3

The semiquantitative shaking and dissolution experiments with different gel image ^¬ ner 1 / gelling agent 2 combinations are shown in Table 4 below.

19

Table 4

The table shows the status of the shaking experiments after 8 days and after 43 days; after 43 days was quantitatively evaluated; , the supernatant Lö ^¬ solutions were distributed and then the residue first dried for 24 h at 40 ° C and then allowed to stand for about 50 h at room temperature. Weighed in at approx. 0.5 gr (+/- 5% weighing error)

The solubility tests were (let stand) in 30 g of tap water containing 0.5 g in mass verschließba ^¬ ren vessels at room temperature.

The experiments simulate a storage and flushing in the toilet, although only a maximum of once a day is rinsed. Flushing means that the supernatant is shaken flues ^¬ sigkeit first (simulates the turbulence in the plenum chamber) and decanted to ^¬ closing. Then wound ^¬ taken is again with fresh tap water. AF = Sylvaclear AF 1900

A 200 = Sylvaclear A 200

X-54 = Sylvaclear X-54-188-152

WF = Sylvaclear WF 1500

PA = Sylvaclear PA 1200

PE = Sylvaclear PE 400V

Orange Fun = perfume

Marlinat = Marlinat 242 / 90T

Imbentin = Imbentin AG / 168S / 110

Tego = Tego Carbomer 134 polyacrylate

OF = surface

Claims

claims

1. Use of a piece-shaped sanitary agent for use in the water box of a toilet, which means comprises at least two different gelling agents (1, 2) and fragrances,

wherein one gelling agent (gelling agent 1) forms gels with hydrophobic liquids, the gels are insoluble or sparingly soluble in water, and the other gelling agent (gelling agent 2) is water-soluble or water-dispersible, and wherein the agent is transparent, gradually rinses off and perfumes releases and gel formers 1 and 2 are present in one phase.

2. Use according to claim 1, characterized in that the gelling agent 1 from the group of polyamide resins or

Olefin homopolymers and copolymers of two and more olefins is selected.

3. Use according to claim 2, characterized in that the polyamide resin from the group of the ester-terminated polyamides (ETPA), the ester-terminated dimer acid-based polyamide resin (ETDABP), the amide-terminated polyamides (ATPA) and the polyalkyleneoxy Polyamide (PAOPA) is selected and the olefin homopolymer or copolymer of two or more olefins selected from the group of polybutadiene rubbers, the styrene-butadiene block u. Copolymers and the polyisopropene is selected.

4. Use according to one of the preceding claims, characterized in that the other gelling agent (gelling agent 2) is a surfactant, a water-soluble or water-dispersible polyamide resin or a natural or synthetic gel-forming polymer.

5. Use according to claim 4, characterized in that the surfactant is an anionic, nonionic or amphoteric surfactant, wherein the anionic surfactant is preferably selected from the group of ether sulfates, the sulfonates, phosphate and in particular an alkylbenzenesulfonate, a Fatty alcohol polyethylene glycol ester sulfate, an alkyl ether sulfate or an alkyl polyglycol ether phosphate.

6. Use according to one of the preceding claims, characterized in that the perfume fraction is less than 70% and between 1 and 40 wt.%, Preferably between 3 and 30 wt.% And particularly preferably between 4 and 15 wt.% Is.

7. Use according to one of the preceding claims, characterized in that the proportion of gelling agent 1 in the agent at least 30 wt.%, Preferably at least 40 wt.% And particularly preferably at least 50 wt.% Is.

8. Use according to one of the preceding claims, characterized in that the proportion of the gelling agent 2 in the means between 5 and 80 wt.%, Preferably between 8 and 60 wt.% And particularly preferably between 15 and 50 wt.% Is.

9. Use according to one of the preceding claims, characterized in that the flushing numbers of the agent present in a water box at 16 ° C at least 150, preferably at least 200, amount.

10. A method for scenting toilets, characterized in that a piece-shaped transparent sanitary agent comprising at least two different gelling agent (1, 2) and fragrances, wherein one gelling agent (gelling agent 1) with gels hydrophobic forms gels, the gels insoluble in water or sparingly soluble, and the other gelling agent (gelling agent 2) is water soluble or

is water-dispersible and gelling agents 1 and 2 are present in one phase, is placed in the water box of a toilet, whereby it gradually rinses off and releases fragrances.